[FFmpeg-user] Can not resample 6 channels @ 48000 Hz to 6 channels @ 48000

Mike Scheutzow mike.scheutzow at alcatel-lucent.com
Mon Mar 28 16:47:36 CEST 2011

Bernd Butscheidt wrote:
> So question 1:
> Why does ffmpeg not recognize the given audio correctly (assuming mediainfo does 
> this job correctly)?

ffmpeg does recognize it. But ffmpeg is very limited in the processing 
it can do with audio having more than 2 channels.

As of today, it seems that if you ask ffmpeg to *decode* ac3 5.1, then 
it is always downmixed to 2 channels. If anyone knows different, I'd 
like to hear about it.

> Question 2:
> Why does the newer ffmpeg version not proceed with the reencode giving the error 
> message in the subject?

The specific error you got is telling you that the ffmpeg audio 
resampler is not a remixer: it does not know how to change 2 channel 
audio into 6 channel audio.

Mike Scheutzow

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